body {
    font-family: Arial, sans-serif;
    padding: 20px;
}

#login-section {
    margin-bottom: 20px;
}

#message-section {
    margin-top: 20px;
}

#private-chat,
#group-chat {
    margin-bottom: 20px;
    border: 1px solid #ccc;
    padding: 10px;
}

input,
button {
    margin: 5px;
    padding: 8px;
}

#private-message-list,
#group-message-list {
    border: 1px solid #ccc;
    padding: 10px;
    height: 200px;
    overflow-y: scroll;
}